Stormwater Quality Design Manual (May 2007) - City of Sacramento ...

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Runoff Reduction Fact SheetDisconnected PavementTable DP-1. Disconnected Pavement Design CriteriaAlso see Appendix D for information on calculating runoff reduction credits.Variation/ Design Parameter CriteriaPavement Draining to LandscapingImpervious Surface Spread sheet flow into vegetated area (to maximize contact with vegetation) using curbcutouts or notches as acceptable to local permitting agency.Impervious-Porous Ratio 2:1 maximum (see Appendix D)VegetationEnsure that there are no channels, low conveyance areas or other features that wouldcause short-circuiting.Plant with dense vegetation appropriate for erosive flows.DrainagePlace an area drain in vegetated feature, located to maximize travel distance of flowthrough landscaping, or allow for overflow water to sheet flow out of vegetated area todrainage system, as approved by local permitting agency.Underdrain Required in C and D soils. Use a gravel trench or perforated pipe embedded in a 8-12-inch layer of crushed rock. Connect to storm drain (not sanitary sewer).Pavement Draining to Porous PavementImpervious-Porous Ratio 2:1 maximum (see Appendix D)OtherSee design criteria for Porous Pavement Fact Sheet elsewhere in this chapter.Sources: Ventura and Denver.References• Adams, M.C. 2003. Porous Asphalt pavement with recharge beds: 20 years & still working.Stormwater. May/June 2003.• City of Portland Stormwater Management Manual. Revision 3, September 1, 2004.• National Menu of Best Management Practices for Storm Water Phase II. United States EnvironmentalProtection Agency. 2002. http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm• Nonpoint Education for Municipal Officials. University of Connecticut. accessed May 26, 2006.http://nemo.uconn.edu• Paris N. and M. Chusid. 2006. Coloring Pervious Pavement…because protecting the environmentshould be beautiful. www.ConcreteDecor.net Dec/Jan 2006.• SMRC, The Stormwater Manager’s Resource Center. Fact Sheets.http://www.stormwatercenter.net/Assorted%20Fact%20Sheets/Tool6_Stormwater_Practices/Infiltration%20Practice/Porous%20Pavement.htm accessed June 14, 2006.• Start at the Source - Design Guidance Manual for Stormwater Quality Protection, Bay AreaStormwater Management Agencies Association, 1999.• Stormwater C.3 Guiedbook: Stormwater Quality Requirements for Development Applications.Contra Costa Clean Water Program. Contra Costa, CA, March 2005.• Sustainable Infrastructure Alternative Paving Materials Subcommittee Report. City of Portland.October 3, 2003.• Truckee Meadows Regional Storm Water Quality Management Program: Draft Low ImpactDevelopment Handbook. August 2005.• Urban Storm Drainage Criteria Manual Volume 3 – Best Management Practices. UrbanDrainage and Flood Control District. Denver, CO. September, 1999 (Rev. October, 2005).• Virginia Stormwater Management Program Handbook. Virginia Department of Conservation andRecreation. 1999.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007DP-5
Runoff Reduction Control Measure Fact SheetAlternative Driveway DesignDescriptionAlternative driveways are designed to reduce thevolume and rate of runoff and increase localizedinfiltration. These driveways exhibit one or moreof these features: they have permeable surfaces,drain to landscaping, provide access to more thanone house, and/or limit concrete use to narrowdriving strips.It is recommended that you read the PorousPavement and Disconnected Pavement factsheets before using this one, since this techniqueemploys principles from those.Siting Considerations• Land use: Single-family residential development and redevelopment.• Driveway slope: 10% maximum.• Soils: Appropriate for all soil types but porous pavement requires an underdrain for soil types Cand D.Vector Considerations• Potential for mosquitoes in vegetated features of alternative driveways due to standing water willbe greatly reduced or eliminated if the driveway is properly designed, constructed, and operatedto maintain its infiltration capacity.Advantages• Replaces regular pavement, so does not require additional land on the site.• Can reduce size of downstream stormwater quality treatment measures by reducing the volumerequired to treat.• Sometimes more attractive than traditional pavement.Limitations• If driveway includes a public right-of-way or utility easement, contact local permitting agency todetermine if alternative driveway design is acceptable and if so, any special requirements.• See Siting Considerations.Maintenance Recommendations (None to Low 1 )• Driveways with disconnected pavement require no additional maintenance over traditionaldriveways, but accumulations of sediment adjacent to driveway need to be removed periodicallyto keep surface water flowing evenly into the adjacent porous area.• Refer to Porous Pavement fact sheet for maintenance requirements related to pavers, modularblock and other porous materials.1 Compared to stormwater quality treatment control measures discussed in Chapter 6.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007AD-1
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Table of contentsOutdoor Work Areas
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Table of contentsSF-1.SF-2.SF-3.SF-
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Other Development Community Reviewe
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1 IntroductionPurposeThis Stormwate
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IntroductionFor redevelopment proje
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Glossaryexposure of construction ma
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GlossaryLow Impact Development (LID
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GlossaryRegional Stormwater Quality
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Appendix ASubmittal RequirementsThe
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Sacramento County Supplemental Appl
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Example Post Construction Stormwate
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Typically maintenance agreements an
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Example Maintenance Covenant(Sacram
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Device in accordance with the maint
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[attach]DECLARANT’S ACKNOWLEGEMEN
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Recorded at the request of:CITY OF
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9. The obligations herein undertake
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EXHIBIT B[Map/Illustration]
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City of FolsomThe City of Folsom ow
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Appendix D-1: Residential Sites: Ru
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Form D-1d: Alternative Driveway Des
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Form D-2a: Disconnected Pavement Wo
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Appendix D-3Runoff Reduction Credit
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These tables refer to runoff reduct
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Mature TreeShape Canopy (dia.) Heig
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Appendix D4LID Credits Background R
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unoff from the driveway by 60% whil
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The designer must determine how man
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Or the ASCE-WEF method (Sacramento)
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Table 3 - Multipliers Based on Rati
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Using the Effective Area Managed in
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SMRC, The Stormwater Manager’s Re
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Flow-based control measure design s
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4. Apply the Rational Formula to ca
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5. Enter the capture curve selected
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1.201.000.80STORAGE (in)0.600.4024-
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1.201.000.80STORAGE (in)0.600.4048
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Subject: VEGETATED SWALE EXAMPLEPLA
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PART II:Routing Excess Runoff throu
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4. Design the OutletThe outlet shou
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Exhibit 1Water Quality Orifice Outl
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3. Calculate Planter Surface Area A
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• Bottom slopes of 0.01 to 0.05%
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Appendix HDrainage Design and Storm
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